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DC Generators - Interview Questions and Answers

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71. D.C. series generator is used
A. to supply traction load
B. to supply industrial load at constant voltage
C. voltage at the toad end of the feeder
D. for none of the above purpose
Explanation:
72. In a D.C. generator the critical resistance refers to the resistance of
A. brushes
B. field
C. armature
D. load
Explanation:
73. In a D.C. generator in order to reduce sparking at brushes, the self-induced e.m.f. in the coil is neutralised by all of the following except
A. interpoles
B. dummy coils
C. compensating winding
D. shifting of axis of brushes
Explanation:
74. To avoid formation of grooves in the commutator of a D.C. machine
A. the brushes of opposite polarity should track each other
B. the brushes of same polarity should track each other
C. brush position has no effect on the commutator grooving
D. the brushes of opposite polarity should track each other
Explanation:
75. In D.C. generators the polarity of the interpoles
A. is the same as that of the main pole ahead
B. is the same as that of the immediately preceding pole
C. is opposite to that of the main pole ahead
D. is neutral as these poles do not play part in generating e.m.f.
Explanation:
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